Dual-Phase 18F-FDG PET in the Diagnosis of Pulmonary Nodules with an Initial Standard Uptake Value Less Than 2.5
Chao-Jung Chen1,
Bi-Fang Lee1,
Wei-Jen Yao1,
Lili Cheng2,
Pei-Shan Wu1,
Ching Lin Chu3 and
Nan-Tsing Chiu1
1 Department of Nuclear Medicine, National Cheng Kung University Medical Center,
138 Sheng-Li Rd., Tainan 704, Taiwan.
2 Department of Radiology, National Cheng Kung University Medical Center,
Tainan, Taiwan.
3 Department of Psychiatry, National Cheng Kung University Medical Center,
Tainan, Taiwan.

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Fig. 1A —59-year-old man with indeterminate 0.8-cm-diameter pulmonary
nodule in right middle lobe managed with wedge resection of right middle lung.
Pathology report showed granulomatous inflammation composed of clustered
epithelioid histiocytes with Langhans' giant cells. Special stain revealed
acid-fast bacilli. 18F-FDG PET image shows initial maximal standard
uptake value of nodule (arrow) was 2.4.
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Fig. 1B —59-year-old man with indeterminate 0.8-cm-diameter pulmonary
nodule in right middle lobe managed with wedge resection of right middle lung.
Pathology report showed granulomatous inflammation composed of clustered
epithelioid histiocytes with Langhans' giant cells. Special stain revealed
acid-fast bacilli. FDG PET image acquired 1 hour after A shows delayed
maximal standard uptake value of nodule (arrow) increased to 3.5.
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